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Packet trade
The packet trade was the carriage of mail, passengers, and cargo by vessels on fixed schedules, beginning with the Black Ball Line between New York and Liverpool in 1818.
PackNet
PackNet is a continual learning method for deep neural networks, introduced by Mallya and Lazebnik at CVPR 2018, that adds tasks by pruning and freezing weights.
Packstation
Packstation is a network of automated self-service parcel lockers operated by DHL in Germany, launched in 2003 as the first automated parcel locker system worldwide, with over 12,500 machines.
PACS (wireless)
PACS, the Personal Access Communications System, was a low-power US wireless standard for PCS and wireless local loop telephony in the 1.9 GHz band, standardized as ANSI J-STD-014.
PacWave
PacWave is a wave energy testing facility operated by Oregon State University off Newport, Oregon, with two sites; its grid-connected South site is the first of its kind on the continental US grid.
Padding (cryptography)
Padding (cryptography), or cryptographic padding, is extra data appended to a plaintext before encryption so its length is a whole number of cipher blocks; poor padding handling enables padding oracle attacks.
Padding oracle attack
A padding oracle attack is a side-channel attack in which a decryption system reveals whether padding is valid, letting attackers decrypt ciphertext, and often encrypt data, without the key.
Paddle steamer
A paddle steamer, also called a paddlewheeler, is a steam-powered watercraft driven by side paddle wheels or a single stern wheel; it dominated river and coastal steam navigation until the screw propeller displaced it at sea.
PaddlePaddle
PaddlePaddle (飞桨, "flying oar") is an open-source deep learning framework developed by Baidu, first released in 2016 and described as China's first self-developed industrial platform.
Padma Bridge (পদ্মা সেতু)
The Padma Bridge (পদ্মা সেতু), formally the Padma Multipurpose Bridge, is a 6.15 km road and rail bridge over the Padma River in Bangladesh, opened in 2022.
Padmanabhapuram Palace
Padmanabhapuram Palace, also known as Kalkulam Palace, is a 16th-century wooden palace complex at Thuckalay, Tamil Nadu, that served as the capital seat of the Travancore kingdom.
Padmanabhaswamy Temple
Sree Padmanabhaswamy Temple is a Hindu temple dedicated to Vishnu in Thiruvananthapuram, Kerala, rebuilt in granite by Marthanda Varma between 1729 and 1733, and among the richest places of worship in the world.
Paducah Gaseous Diffusion Plant
The Paducah Gaseous Diffusion Plant is a former uranium enrichment facility in McCracken County, Kentucky, that enriched uranium by gaseous diffusion from 1952 to 2013.
Paexo
Paexo is a family of passive industrial exoskeletons made by the German company Ottobock, first produced in 2018 to reduce strain from overhead work and lifting.
Pagan's Motorcycle Club
Pagan's Motorcycle Club, also known as Pagans MC, is an American outlaw motorcycle club founded in Maryland in the late 1950s and concentrated on the East Coast.
Pagani Automobili
Pagani Automobili is an Italian manufacturer of hand-built hypercars, founded by Horacio Pagani in 1998 in San Cesario sul Panaro near Modena, Italy, and known for the Zonda, Huayra, and Utopia model lines.
Pagani Huayra
The Pagani Huayra is an Italian mid-engine two-seat hypercar built by Pagani Automobili, unveiled at the 2011 Geneva Motor Show and named after the Andean god of wind.
Pagani Zonda
The Pagani Zonda is a mid-engine, V12-powered sports car made by Italian manufacturer Pagani Automobili, unveiled at the 1999 Geneva Motor Show; 140 street-legal examples were built by 2024.
Pagbilao power station
The Pagbilao power station is a coal-fired power station on Isla Grande in Pagbilao, Quezon, Philippines, supplying baseload electricity to the Luzon grid since the mid-1990s.
Page (computer memory)
A page, also called a memory page, is a fixed-length block of memory used as the basic unit of management in a computer's memory system, typically 4 KB on x86.
Page cache
The page cache is a disk cache maintained by the Linux kernel, holding file data in unused memory so repeated reads avoid disk access; it is the primary interface between user programs and filesystems.
Page fault
A page fault is an exception raised when a program accesses virtual memory not present in physical memory, letting the operating system load the page or terminate the process.
Page table
A page table, also called a page translation table, is the data structure in physical memory that the MMU uses to map a process's virtual pages to physical frames.
PagedAttention
PagedAttention is an attention algorithm for large language model serving that manages the KV cache in fixed-size blocks like virtual memory, proposed at UC Berkeley in 2023.
Pager
A pager, also called a beeper, is a small portable radio receiver that receives short one-way messages; invented in 1949, it peaked in the 1990s and survives in hospitals.
PageRank
PageRank, Google's algorithm, is a link-analysis method that assigns importance scores to web pages, developed by Larry Page and Sergey Brin at Stanford University in the late 1990s.
PagerDuty
PagerDuty is a San Francisco software company founded in 2009 whose platform manages on-call scheduling, alert routing, and incident response for technical operations teams, going public in 2019.
Pages (word processor)
Apple Pages is a word processor and page-layout application for macOS, iOS, and iPadOS, first released in 2005 and included free with every new iPhone, Mac, and iPad.
Paging (memory management)
Paging is a memory management technique that divides virtual memory into fixed-size pages mapped to page frames in physical memory, using page tables for translation.
Pagoda
A pagoda is a tiered tower associated with Buddhist temple complexes in East and Southeast Asia, built of stone, brick, or wood to house sacred relics.